Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a grade com um tempo de +6.8359/tempo de aposentadoria?
 ###Tabelas: CREATE TABLE list_of_pastoral_regions (list_of_pastoral_regions_id AUTO_INCREMENT PRIMARY KEY, Pastoral Region VARCHAR, Episcopal vicar VARCHAR, Parishes INT, High schools INT, Elementary schools VARCHAR, Cemeteries INT) CREATE TABLE classification (classification_id AUTO_INCREMENT PRIMARY KEY, Fin. Pos VARCHAR, Car No. VARCHAR, Driver VARCHAR, Team VARCHAR, Laps VARCHAR, Time/Retired VARCHAR, Grid VARCHAR, Laps Led VARCHAR, Points VARCHAR) CREATE TABLE list_of_imperial_vicars_1437-1792 (list_of_imperial_vicars_1437-1792_id AUTO_INCREMENT PRIMARY KEY, Interregnum began VARCHAR, Interregnum ended VARCHAR, Duration VARCHAR, Count Palatine of Saxony VARCHAR, Count Palatine of the Rhine VARCHAR) CREATE TABLE team_career_passing_records (team_career_passing_records_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Completions INT, Attempts INT, Completion % VARCHAR, Yards INT, Touchdowns INT, Interceptions INT, QB Rating VARCHAR) CREATE TABLE full-time_teams (full-time_teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Truck(s) VARCHAR, Driver(s) VARCHAR, Primary Sponsor(s) VARCHAR, Owner(s) VARCHAR, Crew Chief VARCHAR)  
SELECT Grid FROM classification WHERE Time/Retired = +6.8359